A three-dimensional numerical analysis model was developed using the complex geological modeling techniques, Surpac and FLAC^3D. The initial geo-stress field was obtained by using multiple linear regression method, and the distribution law of in-situ geo- stress field around the stope was obtained by geometric cross- scale model- building technology. On the basis of that, the characteristics of mechanical response of surrounding rocks in deep hole pillarless retreating mining at deep stope were studied. The results showed that: 1) The maximum tensile stress of 0.40 MPa and the maximum horizontal displacement of 28.2 mm were observed at south side of the stope near the Y-central axis. The maximum vertical stress of surrounding rocks was found to be significant at stope roof near the Y-central axis with the maximum value of 27.43 mm. Plastic failure occurred in these corresponding regions. 2) Field monitoring and security measures need to be strengthened near the Y-central axis. The hole net parameter needs to be adjusted in eastward lateral caving due to accumulated damage of blasting. In the south side of the stope, it is necessary to increase presplit holes and reduce single hole explosive load and the initiation dose of each segment to prevent the overbreak of the pillar to affect the stability of the entire extent.

mechanics test  /  regression inversion method  /  geo-stress field  /  model reconstruction